Oakton 35631-00 Operating Instructions Manual

Oakton 35631-00 Operating Instructions Manual Manual pdf 9 page image

1716Temperature calibration1. Make sure the conductivity cell (oralternative temperature element) isattached to the 6-pin connector.2. Switch the meter on. The ATC annuncia-tor will appear at the right-hand side ofthe LCD.3. Press the CAL/MEAS key to entercalibration mode (either pH orconductivity). The CAL indicator willappear above the primary display.4. While in calibration mode, pressthe MODE key to enter temperaturecalibration mode. The primary displayshows the last set temperature value andthe secondary display shows the temper-ature reading with zero offset.See figure5. Dip the ATC element into a solution ofknown temperature (i.e. a temperaturebath). Allow time for the temperatureelement to stabilize.6. Scroll with the t and s keys to setthe correct temperature value (i.e. thetemperature of the temperature bath).You can adjust the reading in incrementsof 0.1°C.See figure7. Once you have selected the correcttemperature, press the ENTER key.The meter automatically returns topH measurement mode.Temperature calibrationThe temperature sensor (located in the conductivity cell) is factory calibrated.Calibrate your sensor only if you suspect sensor drift that may have occurredover a long period of time or if you have a replacement probe.4.5ATCCALFBBATCCALFAANotes• You can offset the temperature reading up to ±5°C from the original reading.• To exit this program without confirming the temperature calibration value, DO NOTpress ENTER in step 7. Press CAL/MEAS instead.5. MeasurementTo take readings:1. Rinse the pH electrode with deionizedor distilled water before use to removeany impurities adhering to the probebody. If the pH electrode has dehydrated,soak it for 30 minutes in electrode storagesolution or a 2M–4M KCl solution.2. Press ON to switch on meter.3. Press the MODE key to select pHmeasurement mode. The MEAS annun-ciator appears on the top center of theLCD. The ATC indicator appears in thelower right hand corner to indicateAutomatic Temperature Compensation.See figureNOTE: For pH manual temperaturecompensation, you must disconnect theconductivity cell from the 6-pin connector.The ATC indicator will disappear fromthe display. You also need to set a manualtemperature compensation value—see page22 for directions.4. Dip the pH electrode into the sample.Since the conductivity cell contains thetemperature sensor, make sure it is alsoimmersed in your solution.When dipping the probe into the sample,the sensor or the glass bulb of the electrodemust be completely immersed into thesample. Stir the probe gently in the sampleto create a homogenous sample.5. Allow time for the reading to stabilize.Note the reading on the display. If theReady indicator is selected on, it willappear when the reading is stable. Seepage 20 for more information.6. Press the MODE key to toggle betweenpH and conductivity readings.Taking pH Measurements5.1ATCREADYMEASCpHAA